90 lines
4.5 KiB
Org Mode
90 lines
4.5 KiB
Org Mode
:PROPERTIES:
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:ID: c52036a9-25ec-4b8b-8b72-90fcd9ea65dd
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:END:
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#+title: azos/exwm
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#+filetags: :project: :knowledge: :exwm:
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#+title: azos/exwm
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#+filetags: :project: :knowledge: :exwm:
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Backlink: [[id:bf4dde56-0967-4374-94ed-771301e47c66][azos]]
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* Architecture
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EXWM feature: =azos-core/features/exwm/emacs/config.org= (literate), packaged via
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=_pkg.nix= (=azos-emacs-exwm=), enabled by =azos.suites.exwm.enable=.
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The feature registers two independent flake modules:
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- =config.flake.modules.homeManager.exwm= — packages, =.xinitrc=/=.login.sh=,
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udiskie. Pure home-manager, no NixOS dependency — can be applied via
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standalone home-manager on a non-NixOS distro (e.g. nix-in-userspace on
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Fedora).
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- =config.flake.modules.nixos.exwm= + =nixos-base= — =services.xserver=,
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greetd/startx wiring, =services.udisks2=, system packages (tuigreet, xinit).
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NixOS-only; on a non-NixOS host this half must be replaced with
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distro-native equivalents (Fedora's own Xorg/display-manager/udisks2 setup).
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Key custom keys:
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- =s-r= -> =exwm-reset= -> calls =exwm-input-grab-keyboard= (switches window to
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full "line-mode": Emacs captures all keys)
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- =C-c C-k= (EXWM's own default binding in =exwm-mode-map=) -> =exwm-input-release-keyboard=
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(switches to "char-mode": app captures keys)
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- =exwm-input-prefix-keys= (config.org ~230): keys that always reach Emacs even in
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char-mode: =C-x C-u C-h M-x M-& M-: M-\ s-d s-m s-r s-s s-q H-l C-w C-c C-@=
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- =exwm-input-global-keys=: s-f2, s-tab, s-w, s-0..9, s-&, always grabbed regardless
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of mode (system-wide, via =exwm-input--global-prefix-keys=)
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* Gotchas
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** Line-mode does NOT mean "all keys reach Emacs unconditionally"
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Even when an EXWM window is in full line-mode (grabbed via =exwm-input-grab-keyboard=,
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an actual =XGrabKey Modifiers:Any Key:Any= on that window), EXWM's dispatcher
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(=exwm-input--on-KeyPress-line-mode= -> =exwm-input--event-passthrough-p=) still
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filters every keypress. A key is only sent to Emacs's command loop if:
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- it's in =exwm-input--global-prefix-keys= (derived from =exwm-input-global-keys=), or
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- it's in =exwm-input-prefix-keys=, or
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- =(lookup-key (current-local-map) (vector event))= is non-nil — but
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=current-local-map= only sees the buffer's own local map (effectively
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=exwm-mode-map=), NOT minor-mode keymaps or =global-map=.
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Consequence: any key bound ONLY via a global minor mode (e.g. this repo's
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=azos/global-minor-mode/keymap=, which is how =M-\= -> =split-window-horizontally=
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is bound in =azos-core/features/base/emacs/config.org=) will silently fail inside
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EXWM windows — the keypress gets bounced back to the underlying app instead of
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running the Emacs command — even though =(key-binding (kbd "M-\\"))= correctly
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resolves it when checked directly (that function walks the full keymap stack,
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unlike the local-map-only check EXWM uses).
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Fix: add the key to =exwm-input-prefix-keys= in
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=azos-core/features/exwm/emacs/config.org= (~230). This is unrelated to EXWM
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package version — confirmed the relevant dispatch functions
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(=exwm-input--event-passthrough-p=, =-on-KeyPress-line-mode=,
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=-grab-keyboard=/=-release-keyboard=, =exwm-reset=) are byte-identical across
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a =nix flake update= that bumped =emacs-exwm= 0.34.0.20250919 -> 0.34.0.20260204.
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** C-h k "not working" inside EXWM is often just mid-sequence
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=C-h k= is correctly wired (=C-h= is in =exwm-input-prefix-keys=). If it looks
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inert, it's because =describe-key= is waiting for a third keypress (the key to
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describe) — the minibuffer prompt is there, just easy to miss if focus/echo
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isn't visible.
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** Debugging EXWM keybinding issues live
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=exwm-debug-mode= does NOT enable exwm's internal logging (=exwm--log= checks the
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special var =exwm-debug= at macro-EXPANSION time, so it's compiled out entirely
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if the package was byte-compiled with it off — toggling the mode at runtime is a
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no-op for logging). Instead, use =emacsclient= to:
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- check real state: =(with-current-buffer BUF (list exwm--input-mode exwm--id))=
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- check real X input focus: =(slot-value (xcb:+request-unchecked+reply
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exwm--connection (make-instance 'xcb:GetInputFocus)) 'focus)=
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- add temporary =advice-add ... :before= on =exwm-input--on-KeyPress= /
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=-on-KeyPress-line-mode= to log which keys actually reach the dispatcher
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- simulate real physical keypresses (not just synthetic events aimed at a
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window) with =nix shell nixpkgs#xdotool --command xdotool key --clearmodifiers
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<keys>= — this uses XTEST and goes through the same X input pipeline as real
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hardware, unlike =xdotool key --window ID= which uses SendEvent and can behave
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differently.
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